3" open exhaust???

[122 Vega]

So I wonder how a 3" exhaust with cat, no muffler would sound. I know loud, but it would be for track purposes only, I would have a muffler for the street...

Britt

 

[KyRaceFan]

Sounds dirty as hell. Lots of turbine, lots of raspyness, and over all extremely loud. I ran 3in no muffler for a few days back when i got my exhaust put on. It was "cool" but the novelty wore off very quick. For track purposes, it would be fine, but any good 3in high flow muffler isnt going to kill any gains, so it would be worth it to just get a muffler. Dynomax is what i use, and it sounds great.

 

[OrngSpd03]

LOUD AS CRAP! I had that setup and ended up putting on a High Flow Muffler. Still to loud to daily drive. It just droned on the inside and gave me a headach. Added a Areo-Turbine Resonator and It toned it down enough to allow me to actually hear the radio and not get a migrane. I haven't run a dyno yet but it feels like there is more torque. The resonator hasnt hurt the preformance and it made the tone sound good.

 

[ThrillRide]

if it is for the track then why have the cat either? who cares how loud it is if it is only for the track. the cat takes away more power than the muffler does.

 

[turbo speedy]

well idk i did it for a couple of days i hated every minute of it.

 

[122 Vega]

if it is for the track then why have the cat either? who cares how loud it is if it is only for the track. the cat takes away more power than the muffler does.

Reason being is that in SCCA Atocross STX class, it has to remain emissions legal with at least one cat, and has to be under a certain volume 104 db IIRC. But I am not allowed to control boost any, so I am hoping to take advantage of creep with the least amount of backpressure available.

At the track, I don't want to have to pull the cat (GHLs isn't flanged anyways), so it would be easier to just have a replacement 3" axle back to swap with the muffler.

Britt

 

[ThrillRide]

Reason being is that in SCCA Atocross STX class, it has to remain emissions legal with at least one cat, and has to be under a certain volume 104 db IIRC. But I am not allowed to control boost any, so I am hoping to take advantage of creep with the least amount of backpressure available.

At the track, I don't want to have to pull the cat (GHLs isn't flanged anyways), so it would be easier to just have a replacement 3" axle back to swap with the muffler.

Britt

ah! that makes sense then. the axleback section really won't afford you much power unless you are upping the boost. the resonator and muffler are both straight through designs. i would save the $ and use it for something else. go all redline fluids...which should help out a great deal in the mid range due to the friction with the msp. maybe do a ground wire kit or better suspension mods if you don't already have that stuff. just my .02. thats what i would do rather than the axle back.

 

[DsourceMsp]

I thought at a track you had to have a muffler?

And also IMO I would not do a grounding kit. To me its pointless and a waste of $100 or so. Go with some suspension mods instead of an alternate axle-back

 

[ThrillRide]

just curious why is a grounding kit a bad idea? plus you should never spend 100bucks on one. make it yourself for cheap.